Bulugh al-Maram #917

Narrated : I said, "O Allah's Messenger, I sell camels at al-Baqi'. I sell for Dinars and take Dirhams (for them), and sell for Dirhams, and take Dinars (for them), I take this for that and give that for this (i.e. Dinars and Dirhams)." Allah's Messenger (ﷺ) replied, "There is no harm in taking them at the current rate so long as you do not separate leaving something still to be settled (from the exchange)." .